今天的目標是要配置pom.xml。

只要在pom.xml這隻裡面配置好dependency，就會幫你把你需要的jar檔載下來。

要先在pom.xml裡面加入下面的設定。

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.sample4</groupId>
  <artifactId>sample4</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>sample4 Maven Webapp</name>
  <url>http://maven.apache.org</url>
<dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>${spring.version}</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${spring.version}</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>${spring.version}</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>${spring.version}</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-expression</artifactId>
      <version>${spring.version}</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${spring.version}</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${spring.version}</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${spring.version}</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-aspects</artifactId>
	<version>${spring.version}</version>
</dependency>
 <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.7</version>
      <scope>runtime</scope>
 </dependency>
 <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.7</version>
      <scope>runtime</scope>
 </dependency>
 <dependency>
	<groupId>javax.servlet</groupId>
	<artifactId>javax.servlet-api</artifactId>
	<version>3.1.0</version>
        <scope>provided</scope>
</dependency>
<dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.0</version>
      <scope>provided</scope>
</dependency>
 <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
      <scope>compile</scope>
 </dependency>
 <dependency>
      <groupId>cglib</groupId>
      <artifactId>cglib-nodep</artifactId>
      <version>2.2.2</version>
      <scope>runtime</scope>
</dependency>
<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
	<version>5.1.25</version>
</dependency>
</dependencies>
<properties>
    <spring.version>4.0.7.RELEASE</spring.version>
    <project.build.sourceEncoding>UTF8</project.build.sourceEncoding>
  </properties>
  <build>
    <finalName>sample4</finalName>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

這邊的設定包含了很多，可以把不需要的部分拿掉，其中設定了有

1.JSTL，前端會使用的C標籤，所以我把它加進去
2.SLF4J以及Log4j，這是用來記錄Log的，不需要可以拿掉
3.MySQL Connector，基本上是一定會有，如果需要換資料庫在做調整即可

設定完後，記得存檔，然後到專案上按右鍵->Maven->Update Project->OK
在打開會發現已經幫你把jar檔都載進來了，連帶剛剛的錯誤也都消失了。

以上是pom.xml設定的部分。